How many endangered species are there in the U.S.?

According to U.S. Fish and Wildlife Service, there are 415 endangered animals and 644 endangered plants in the United States as of March 2, 2011. These statistics change often, as species are added...
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How many species of oak trees are there?

There are 600 species of oak in the world. Half of those oaks are native to North America, though they are largely limited to the southern areas of the continent. Oaks are scarce in Canada and othe...
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How many species of gecko are there?

Geckos belong to the scientific family Gekkonidae. There are over 100 genuses in this family and, as of 2010, approximately 1180 gecko species. As researchers study and learn more about geckos, som...
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